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# Friday, November 13, 2009

For some reason C# lacks a decimal truncation function limiting result to a specified number of digits after a decimal point. Don't know what's the reasoning behind, but it stimulates the thoughts. Internet is plentiful with workarounds. A tipical answer is like this:

Math.Truncate(2.22977777 * 1000) / 1000; // Returns 2.229

So, we also want to provide our solution to this problem.

public static decimal Truncate(decimal value, byte decimals)
  decimal result = decimal.Round(value, decimals);
  int c = decimal.Compare(value, result);
  bool negative = decimal.Compare(value, 0) < 0;

  if (negative ? c <= 0 : c >= 0)
    return result;

  return result - new decimal(1, 0, 0, negative, decimals);

Definitely, if the function were implemented by the framework it were much more efficient. We assume, however, that above's the best implementation that can be done externally.

Friday, November 13, 2009 2:31:26 PM UTC  #    Comments [0] -
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